Will this scoop require hood pins or additional fasteners to secure it?

This vents are bolted to your factory hood using existing mounting points. Hood pins are not required for the vent installation itself. However, check your hood's hinge condition and latch function — if your hood is sagging or latching loosely, address that before installing any aftermarket vent to ensure proper panel alignment.

Does the three-piece design affect rain gutter sealing or water intrusion?

The three-piece layout is designed to bolt cleanly using factory locations; the seams are minimal and exterior. After installation, inspect the gaps between pieces and apply weatherstripping or marine-grade silicone caulk around the perimeter if you notice any water tracking during heavy rain. This is standard practice for any functional hood vent.

How much weight does FRP save over a factory steel hood?

FRP is significantly lighter than factory steel hood panels. The exact weight savings depends on the OEM panel's gauge and construction, but FRP scoops typically deliver measurable reduction in front-end unsprung weight — a benefit you'll feel in suspension response and braking balance.